Functions and Subroutines in ASP By: Rob Collyer     As developers, we should endeavour to make our lives easier wherever possible... no one wants to re-invent the wheel after all. Functions and Subroutines exist to not only save us time, but to bring power to our ASP. They are just another way of encapsulating code, but have a lot more functionality than just 'saving some code for later'. First, let's look at Functions... Imagine a balloon salesman in the street. We've all seen them they require one piece of information when you buy a balloon, the colour. Let say we asked for a red balloon... The balloon salesman armed with this 'information' then does a pretty basic action... he hands you the balloon. The balloon you received is a direct result of the information you gave the balloon seller. Functions are just the same... they return to you a value based on the information you provided. Lets look at an example Function: - A Function is passed some information. The information we pass a Function, is known as an 'argument'. The information we get back from a Function is known as the 'return value'. Whilst a Function can have many arguments, it can only have one return value. Let us look at one more example: - Again, another basic example. We should notice this time that the Function accepts two arguments. By now, we have some idea of how to write a Function. How do we use one? Let me show you now how we can use the calcTax example. Above you see the example function in action... easy huh! I have tried to make understanding Functions as easy as possible... Understanding a Subroutine (Sub) is now going to be easy for you. Imagine a block of code that performed some instructions based on information you gave it... Sounds very much like a function, doesn?t it? Well this time, we do not get anything back. A sub does NOT pass back information it just uses the data we give it for some purpose. I will use only one example of a Sub, and in the same example make use of the sub: - The above Sub, demonstrates my point. We put something in, it performs an action (in this case writing to the screen), but nothing is returned to us in the code. One thing that REALLY IS important when using a sub, is that we do not put brackets around the arguments... Because we do not have a return value we do not need brackets and in this case, if we try we will get an error. Well, that just about concludes this article. We should by now be writing efficient code with the use of Functions and Subs. Don?t forget that if you use your functions and subs in multiple pages then you should really store them within include files for reasons of easy maintenance and better performance. Rob Collyer, experienced with 20 years programming knowledge and site administrator of www.webforumz.com - Copyright 2003-2004 Article Source: zeronese.net article directory. Article Word Count Appx. : 612 Article Category: Articles » Web-Development » ASP See all articles by Rob Collyer Note: Copying of article contents in whole is permitted provided that article body and article author by-lines are kept intact and unchanged. Hyperlinks and/or URLs including article source link provided by authors and/or zeronese must remain active at all times.       The views and opinions of authors expressed on Zeronese Article Directory web sites do not necessarily state or reflect those of the Zeronese.net .